D Day failes

Again, Berlin would have been in Russian hands before even the Italian campaign was over. Most of Germany would have been as well if not all of it by the time the Americans got the bomb. There wouldn't be much of a reich left to nuke by the time one was available. Probably you get a smaller version of west Germany.
Not neccessarily; a failed D-Day and no/substantially less Allied presence in France might leave the Germans with more troops to spare, as well as serving as a massive propaganda victory/morale booster for the Axis. Not having troops stripped from the Eastern Front for the Battle of the Bulge would also help. Depending on how exactly things work out, Berlin might be able to hold out just long enough to get nuked.
 
Again, Berlin would have been in Russian hands before even the Italian campaign was over.
All the more incentive for LeMay to seek to nuke Berlin. :)

If D-Day failed, might Germany have further assets available against the Soviets, delaying the taking of Berlin? Might additional effort be placed into the Manhattan Project, speeding its fruition.
 
Not neccessarily; a failed D-Day and no/substantially less Allied presence in France might leave the Germans with more troops to spare, as well as serving as a massive propaganda victory/morale booster for the Axis. Not having troops stripped from the Eastern Front for the Battle of the Bulge would also help. Depending on how exactly things work out, Berlin might be able to hold out just long enough to get nuked.

Probably any troops spared from northern france probably would be sent to Italy rather than the East. Also I seriously doubt that the Germans can hold off the Red Army long enough for an A-Bomb to be ready, I mean we're talking like 3 months extra time. Besides, Berlin was not on the top of the list of cities to be nuked in that eventuality, I forget which ones were, maybe hamburg or Munich.
 
Assume that Overlord fails, but Dragoon goes through. Logistically Dragoon is more difficult to support as it is further away, no pipeline under th channel for gas etc. Progress ATL is slower than OTL and the Germans can divert some of the effort in France OTL to the eastern front. Also no Falaise pocket, and no stupendous waste of resources that was the Ardennes offensive. No matter what happens in France the Allied effort in Italy is going nowhere fast and may even be robbed to support Dragoon follow-up. With more resources to move east, the Russians can be slowed. Also, absent Overlord the V-weapons have a greater selection of launching sites so some bombing effort will go there that might have been directed at the Reich itself.

No need to divert many B-29's from Japan. A few go to England to join in the raids, as well as the "silverplated" ones. Odds are the first bomb might be dropped at night, but a German city goes away.

With the Allies in France & the Russians still east of Berlin in August 1945 the dividing lines probably remain very much the same as Russian logistics simply will not allow them to move west past Berlin to Denmark, Holland & the Rhine as fast as the US/UK can move east. The Elbe still is the divider.
 
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